INT 2F - Intel Image Processing Interface - SELECT SCAN LINE                    
	AX = CD03h
	BX = scan line
	CX = requested density in dots per inch (300, 600, or 1200)
Return: AL = status (see also AX=CD04h"Image")
	    00h successful
		CX = density at which scan line was mapped
		ES:DI -> start of scan line
	    80h unsuccessful
	    81h scan line out of range
	    82h unsupported scan line density
	    83h out of memory
SeeAlso: AX=CD04h"Image"